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Social networking site Facebook saw an increase in traffic from14 million visitors per month to 26 million after they opened registration to the general public according to a study from comScore.

The number of pages of content viewed at Facebook in May 2007 increased to15.8 billion, up 143 percent versus May 2006. Visitors averaged 186 minutes at the site in May 2007, which was a 35 percent increase over the same month the previous year.

Because of Facebook's open registration the site was able to attract visitors out side of the 18-24 year old age segment. The largest growth occurred among 25-34 year olds (up 181 percent), while 12-17 year olds grew 149 percent and those 35 and older grew 98 percent. The 18-24 year old segment had the lowest growth with 38 percent.

"Given its roots as a college networking site, Facebook has historically shown very strong skews toward the 18-24 year old age segment," said Jack Flanagan, executive vice president of comScore Media Metrix.

"However, since the decision to open registration to everyone, the site has seen visitors from all age groups flood the site. As the overall visitation to Facebook continues to grow, the demographic composition of the site will likely more closely resemble that of the total Internet audience."